Suppose that a particle moves according to the law of motion
(A) Find the velocity at time .

(B) What is the velocity after 3 seconds?

Velocity after 3 seconds =
(C) Find all values of for which the particle is at rest. (If there are no such values, enter 0. If there are more than one value, list them separated by commas.)

(D) Use interval notation to indicate when the particle is moving in the positive direction. (If the particle is never moving in the positive direction, enter "{}" without the quotation marks.)

Answer =

You can earn partial credit on this problem.